Note: Our best free Linux firewalls round-up has been fully updated. This feature was first published in June 2010.
You're walking down a dark alley, late at night, when suddenly someone jumps out and forces you to hand over your passport, credit cards, and the keys to your car. This is a decent analogy of what using the internet can be like.
Around every corner lurks danger, and given today's always-on connections, you may have the internet equivalent of burglars without even realising. For the ultimate in computer security, a firewall is similar to having a burly bodyguard walking down the street with you, keeping you safe. Most modern routers have…
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